birthroot

from The Century Dictionary.

• noun In botany, a name given to various species of Trillium, especially T. pendulum, the roots of which are reputed to be astringent, tonic, and alterative, and to have a special effect upon the uterus and connected organs. Also called birthwort, and corruptly bethroot and bathwort.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) An herbaceous plant (Trillium erectum), and its astringent rootstock, which is said to have medicinal properties.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Trillium erectum, a perennial plant of North America with deep-red flowers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth